A war of six soldiers

Alex was born in a suspicious cave, filled with unlimited resources for him to use. He lived peacefully in his cave for 10 years, until he finds a note in it giving him the idea to explore the world outside of his cave. On his way, he finds two other kids and three dragons all raised the same way. The dragons knew how to speak English from birth, and the group sets off together. Their world has been torn apart from an enormous war, yet no one really has their heart in it anymore. These six must save their world and find out their past before it's too late.